Are lip studs (and other body jewelry) electro-conductive?

Many women wear studs in their ears.

Some wear studs, or their equivalent, above their lips or have piercings on their cheeks. Others wear have dermal piercings on their backs. And then there are the ubiquitous nipple and tongue piercings.

My question: let’s say you clamped a low-voltage power supply to the ear stud on the left, and another wire to the ear on the right. Would power be transmitted? If a bulb were attached, would it light up?

Same with clamping a power supply to one breast and a cable to the tongue ring. Would the electricity travel through the hardware?